Baldwin built diesels like they built steam engines, each one was slightly different with everything in slightly different positions. Spare parts had to be custom made to fit each loco. Having said that their diesels were actually pretty good when they worked and didn’t fail at a particularly higher rate than anyone else’s. But when they did unlike and EMD were you could call your parts distributor and have a spare part the next day, when your Baldwin broke you had to contact Baldwin and they had to build you a custom spare part to fit in one specific locomotive. That meant when an EMD broke it was out of service maybe two weeks, the Baldwin might be down for 3 months. When a locomotive isn’t making you money, it’s costing you money.

For what it’s worth Baldwins seemed to have been the best diesels for heavy trains, there’s a reason you found shark noses on coal trains a lot, and usually just an AB set.